How to tackle LRDI ? Is mocks question seems to be tougher than cat level ? plzz suggest me something to do ?

Solve more and more LRDI, Mocks LRDI are at the same level as CAT, only practice will improve your Level in LRDI, and keep calm, don't overcommit in the LRDI section during mocks, at the beginning try to solve only 1 set that you find the easiest after briefly going through all the 4 sets you can spend some time say 3-4 minutes in set selection.
Remember stressing in LRDI will decrease your efficiency very significantly.